On 5/13/11, Jason Grout <jason-s...@creativetrax.com> wrote: > On 5/12/11 11:38 PM, Dan Drake wrote: >> If I have a Sage expression, I can do >> >> latex(foo) >> >> to get LaTeX code. Is there an inverse to that function? >> >> Frequently, I do a calculation in Sage and get something complicated. I >> find it easier to look at when typeset by TeX, so I call latex(), paste >> the result into a document, then typeset. >> >> Conversely, sometimes I write something in LaTeX and would like to do >> some calculations with it. So I'd like to call...something, paste the >> result into Sage, and compute. >> >> I'm generally working with reasonably simple symbolic expressions. Is >> this possible? I know that a full parser is practically impossible, but >> it seems like a relatively simple parser could work pretty well. >> >> I think I'm asking for a complement to Rob Beezer's tex2sws. Thoughts? > > If we had this, it would be a lot simpler to do a web-based equation editor. > > Jason
I don't think it exists yet, Dan. However, it should be feasible in simple cases. I have a few ideas on how to do it using TeX (probably not the fastest, but that's the language I know best). Can you please post a couple of typical short-but-thorough examples of LaTeX equations, and the desired output? Don't hesitate to go for "hard" cases, such as matrices, or slightly "dirty" TeX code: anything you may realistically wish to use in practice. I'll try to give the possibility of using a config file to set some defaults (e.g. maybe \Gamma often represents the Gamma function for you, maybe \Gamma is a constant for someone else), and try to make it possible to override them locally. My idea is to write a LaTeX package which when loaded would convert math expressions to a Sage input, stored in an external file. I'm very keen on trying this, as it is related to a recent idea of mine. Start from a Sage symbolic expression, and convert it using latex(). Then given a subexpression in the LaTeX code, be able to go back to the Sage subexpression. The goal would be in the long term to provide reverse search from the jsmath/mathjax displayed equation back to the Sage code. Then it may be possible to e.g. select a subexpression and apply some transformations (i.e. .simplify(), or .collect(...) to the subexpression rather than the whole expression). But that's probably a longer term project. Anyway, give me some examples, and one or two weeks, and I'll try to produce a prototype. Regards, Bruno -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
